@article{10_4007_annals_2009_169_449,
     author = {Alexandru Aleman and Stefan Richter and Carl Sundberg},
     title = {Nontangential limits in $\mathcal{P}^t(\mu)$-spaces and the index of invariant subgroups},
     journal = {Annals of mathematics},
     pages = {449--490},
     publisher = {mathdoc},
     volume = {169},
     number = {2},
     year = {2009},
     doi = {10.4007/annals.2009.169.449},
     mrnumber = {2480609},
     zbl = {1179.46020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2009.169.449/}
}